CN114335950A - Electromagnetic frequency signal separation guided wave structure fused with artificial electromagnetic metamaterial - Google Patents
Electromagnetic frequency signal separation guided wave structure fused with artificial electromagnetic metamaterial Download PDFInfo
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Abstract
The invention relates to an electromagnetic frequency signal separation guided wave structure fused with an artificial electromagnetic metamaterial, which comprises a first transmission layer and a second transmission layer, wherein the two layers are an upper layer and a lower layer, each transmission layer supports electromagnetic wave guiding with different transmission frequencies, and the electromagnetic field transmission of the upper layer and the lower layer is easy to realize frequency signal separation despite space overlapping and has the characteristic of low crosstalk. The first transmission layer and the second transmission layer are both formed by multilayer metamaterial unit laminated structures, each metamaterial unit laminated structure is formed by periodically arraying a plurality of metamaterial unit cells with double-anisotropy according to certain spatial orientation and along an electromagnetic wave guide path, and each double-anisotropy metamaterial unit cell is formed by an air layer, a medium substrate and artificial metal microstructures with different dimensional parameters. The invention has small space occupation for conducting electromagnetic waves with different frequencies and is easy to integrate.
Description
Technical Field
The invention belongs to the field of novel electromagnetic devices, and particularly relates to an electromagnetic frequency signal separation guided wave structure fused with an artificial electromagnetic metamaterial.
Background
If an electromagnetic material has topologically non-trivial properties, its surface supports topologically protected boundary transitions, with the potential to resist certain specific electromagnetic reflections. Compared with the traditional waveguide device, the topological protection boundary transmission state has the advantages of narrow physical channel, controllable dispersion, difficult reflection and the like. Conventionally, many theories and experiments have been carried out in the aspect of protecting the boundary propagation state of the topology by constructing a topological non-trivial photonic crystal, and controlling the transmission of light through the interface state of the photonic crystal.
In the microwave field, with the miniaturization of components and systems, electromagnetic waves can be transmitted in a microstrip line mode under the scenes with strict requirements on volume and weight, but the microstrip line mode is non-closed, and under the condition of dense wiring, signal crosstalk among different lines is easily caused, so that the defects of high system noise, low circuit Q value, low power capacity and the like are caused. The boundary propagation state of the topological protection is physically a slit waveguide, has topological protection, is not easy to reflect, can not form crosstalk for the conduction states with different topological characteristics, and is very suitable for application in high-integration occasions.
However, the current topological protection boundary state depends on topological transition on a bulk of a photon topological insulator, and the realization difficulty is large, so that the current topological protection boundary state is not beneficial to practical large-scale application. The invention is based on the boundary state theory of the spinning electromagnetic material, uses the artificial electromagnetic metamaterial to realize flexible boundary transmission state, and realizes a unique frequency signal separation guided wave structure.
Disclosure of Invention
The invention aims to overcome the defects that the guided wave structure in the existing microwave guided wave technology is large in volume, the guided wave of a transmission line is easy to leak and crosstalk, and provides a novel electromagnetic energy transmission structure for realizing topological protective guided wave based on a non-topological electromagnetic metamaterial by combining a transverse spinning system artificial electromagnetic medium.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the electromagnetic frequency signal separation guided wave structure is based on a photon transverse spin medium and comprises an upper transmission layer and a lower transmission layer for transmitting electromagnetic waves, wherein the two transmission layers are respectively arranged on the upper side and the lower side of the whole composite guided wave structure; the first transmission layer and the second transmission layer transmit electromagnetic waves at different frequencies.
Preferably, the first transmission layer is formed by laminating and combining a plurality of layers of the first artificial metamaterial unit.
Preferably, the second transmission layer is formed by laminating and combining a plurality of layers of second artificial metamaterial units.
Preferably, the first artificial metamaterial unit and the second artificial metamaterial unit are formed by a periodic array of a plurality of metamaterial unit cell structures with magnetoelectric coupling characteristics; the metamaterial unit cells in the first and second artificial metamaterial units are arranged in a back-to-back manner with the light transmission channel as a boundary, that is, the directions of openings of the metamaterial unit cells at two sides of the light transmission channel are opposite.
Preferably, the metamaterial unit cells adopted by the first metamaterial unit and the second metamaterial unit have different structural sizes and different periodic sizes; all the metamaterial units in each metamaterial unit have the same structural size.
Preferably, the metamaterial unit cell consists of a medium substrate layer, an air layer and an artificial metal microstructure attached to the medium substrate; the air layers are arranged on the upper side and the lower side of the medium substrate layer.
Preferably, the artificial metamaterial unit cell with the bi-anisotropic response is a split ring resonant structure.
Preferably, the artificial metal microstructure is a planar structure or a three-dimensional structure which is composed of metal thin layers and has bi-anisotropic response to an electromagnetic field.
Preferably, the dielectric substrate is a Rogers5880 plate.
Preferably, the metal thin layer is made of copper.
Compared with the prior art, the invention has the following beneficial effects:
the electromagnetic frequency separation guided wave structure based on the photon topological boundary state principle has the advantages of novel method, small space occupation for conducting electromagnetic waves with different frequencies and easy integration.
The working frequency of the first type of metamaterial unit and the working frequency of the second type of metamaterial unit can be controlled by adjusting the sizes, the azimuth orientations and the like of the cells of the respective metamaterial units, and the first type of metamaterial unit and the second type of metamaterial unit have the advantages of being capable of being adaptively adjusted according to different transmission frequency band requirements, easy to process and manufacture, low in cost and the like
The electromagnetic frequency signal separation guided wave structure has a certain electromagnetic wave transmission frequency forbidden band, and each transmission layer has a filtering effect aiming at certain specific frequency, so that less electromagnetic wave leakage and low crosstalk among multiple signals are realized.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a diagram of the overall structure and the propagation trajectory of electromagnetic waves in the first transmission layer according to the present invention;
FIG. 3 is a propagation trace of an electromagnetic wave in a first transmission layer;
FIG. 4 is a propagation trace of an electromagnetic wave in a second transmission layer;
FIG. 5 is a top view of a first metamaterial unit stacking mechanism;
FIG. 6 is an elevation view of a first metamaterial unit stacking mechanism;
FIG. 7 is a schematic diagram of a cell structure of a metamaterial.
Detailed Description
As shown in fig. 1, an electromagnetic frequency signal based on an artificial electromagnetic metamaterial separates a guided wave structure including a first transmission layer 10 and a second optical transmission layer 20. The propagation trajectory of the electromagnetic wave in the first transmission layer is as indicated by the heavy solid arrow trajectory in fig. 2.
As shown in fig. 3 and fig. 4, the complete geometric structure of fig. 1 is divided into an upper transmission layer and a lower transmission layer, and the propagation trajectory of the electromagnetic wave in the first transmission layer is shown as the heavy solid arrow trajectory in fig. 3, and the propagation trajectory of the electromagnetic wave in the second transmission layer is shown as the heavy solid arrow trajectory in fig. 4. The first transport layer is made up of a stacked structure 101 of 4 layers of units of a first type of metamaterial. And the second transmission layer is formed by a laminated structure of 4 layers of second type metamaterial units.
Fig. 5 and 6 are a top view and a front view of a first metamaterial unit stacking structure 101, which is formed by arranging a plurality of bi-anisotropic metamaterial unit cells 1011 in a periodic array, wherein the openings of the metamaterial unit cells face outward on one side of the electromagnetic wave transmission track (thick solid line in fig. 3) and the openings of the metamaterial unit cells are oppositely arranged on the other side of the electromagnetic wave transmission track.
As shown in fig. 7, the bi-anisotropic metamaterial unit cell 1011 is composed of an air layer 10111, a dielectric substrate 10112 and an artificial metal microstructure 10113 attached to the dielectric substrate, in this example, an asymmetric split ring resonator (U-shaped SRR) structure is used.
The metamaterial laminated structure 101 has magnetoelectric coupling response to incident electromagnetic waves, supports electromagnetic wave composite spin polarization, supports a linear polarization boundary state between two adjacent metamaterial unit cells 1011 with openings oppositely arranged, and excites a certain electromagnetic wave transmission passband.
The second type of the laminated structure of the metamaterial units is similar to the first type of the laminated structure of the metamaterial units in shape, but the specific size parameters of the second type of the metamaterial unit cells are different from the size of the first type of the metamaterial unit cells, so that the electromagnetic frequency passband capable of being generated by the second type of the metamaterial unit cells is different from the first type of the laminated structure of the metamaterial unit cells.
The first transmission layer and the second transmission layer are stacked, and have a position offset in space in the electromagnetic wave guide region, but the feeding structure is a single conventional feeding port.
In the invention, the feeding mode is feeding waveguide excitation, and can also be other feeding structures supporting TM wave.
In the invention, the dielectric substrate material is Rogers5880, and can also be any other low-loss microwave plate material.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the scope of the present invention.
Claims (10)
1. Fuse electromagnetic frequency signal separation guided wave structure of artifical electromagnetism super structure material, its characterized in that: the composite guided wave structure comprises an upper transmission layer and a lower transmission layer which are used for transmitting electromagnetic waves, wherein the two transmission layers are respectively arranged on the upper side and the lower side of the whole composite guided wave structure; the first transmission layer and the second transmission layer transmit electromagnetic waves at different frequencies.
2. The electromagnetic frequency signal separation guided wave structure fused with the artificial electromagnetic metamaterial according to claim 1, wherein: the first transmission layer is formed by laminating and combining a plurality of layers of first artificial metamaterial units.
3. The electromagnetic frequency signal separation guided wave structure fused with the artificial electromagnetic metamaterial according to claim 1, wherein: the second transmission layer is formed by laminating and combining a plurality of layers of second artificial metamaterial units.
4. The electromagnetic frequency signal separation guided wave structure fused with the artificial electromagnetic metamaterial according to claim 1, wherein: the first artificial metamaterial unit and the second artificial metamaterial unit are formed by a periodic array of a plurality of metamaterial unit cell structures with magnetoelectric coupling characteristics; the metamaterial unit cells in the first and second artificial metamaterial units are arranged in a back-to-back manner with the light transmission channel as a boundary, that is, the directions of openings of the metamaterial unit cells at two sides of the light transmission channel are opposite.
5. The electromagnetic frequency signal separation guided wave structure fused with the artificial electromagnetic metamaterial according to claim 1, wherein: the metamaterial unit cells adopted by the first type metamaterial unit and the second type metamaterial unit have different structure sizes and different period sizes; all the metamaterial units in each metamaterial unit have the same structural size.
6. The electromagnetic frequency signal separation guided wave structure fused with the artificial electromagnetic metamaterial according to claim 4 or 5, wherein: the metamaterial unit cell consists of a medium substrate layer, an air layer and an artificial metal microstructure attached to the medium substrate; the air layers are arranged on the upper side and the lower side of the medium substrate layer.
7. The electromagnetic frequency signal separation guided wave structure fused with the artificial electromagnetic metamaterial according to claim 4 or 5, wherein: the artificial metamaterial unit cell with the double anisotropic response is of a split ring resonance structure.
8. The electromagnetic frequency signal separation guided wave structure fused with the artificial electromagnetic metamaterial according to claim 6, wherein: the artificial metal microstructure is a plane structure or a three-dimensional structure which is composed of metal thin layers and has bi-anisotropic response to an electromagnetic field.
9. The electromagnetic frequency signal separation guided wave structure fused with the artificial electromagnetic metamaterial according to claim 6, wherein: the dielectric substrate is a Rogers5880 plate.
10. The electromagnetic frequency signal separation guided wave structure fused with the artificial electromagnetic metamaterial according to claim 8, wherein: the metal thin layer is made of copper.
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